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Mitosis and Meiosis
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Mitosis Division of the nucleus Also called karyokinesis
-division of somatic (body) cells Division of the nucleus Also called karyokinesis Only occurs in eukaryotes Has four stages Doesn’t occur in some cells such as brain cells
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Mitosis Interphase Prophase Metaphase Anaphase Telophase
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Interphase Interesting things happen! Cell preparing to divide
Genetic material doubles
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Prophase Chromosome pair up! Chromosomes thicken and shorten
-become visible -2 chromatids joined by a centromere Centrioles move to the opposite sides of the nucleus Nucleolus disappears Nuclear membrane disintegrate
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Metaphase Chromosomes meet in the middle!
Chromosomes arrange at equator of cell Become attached to spindle fibres by centromeres Homologous chromosomes do not associate
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Anaphase Chromosomes get pulled apart
Spindle fibres contract pulling chromatids to the opposite poles of the cell
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Telophase Now there are two! Chromosomes uncoil
Spindle fibres disintegrate Centrioles replicate Nucleur membrane forms Cell divides
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